This two pack of locks comes with a Coupler lock for lever style trailer couplers requiring a 2” span. Locks trailer to hitch ball when in use. Helps prevent attaching to an unattended trailer. Coupler Lock with housing and knob cones for flush locking design. Pin Diameter: 0.25", Inside Width: 2", Overall Length: 5.625". Also comes with 1.25" receiver trailer hitch lock is great for locking your bike rack or trailer to the hitch. Hitch lock has a 1/2" diameter and works for all 1.25" receivers. Overall length 5". Comes with 2 Keys. Covered key opening. Easy key insertion and removal. Weather resistant lock. Made in the USA.